Actually, there's also ANOTHER way.
1. Copy HLampMenu.cfg, HLampMenu2.cfg, and HLampMenu3.cfg to your mod's directory (e.g. C:/SIERRA\Half-Life\esf)
2. Add this line to your autoexec.cfg in your mod's directory--create it if it doesn't exist already.
exec HLampMenu.cfg
3. Run Half-Life and bind a key to "root_do". For example, in the console do "bind j root_do" <ENTER>.
4. Press the key you bound to "root_do" and you'll see the menu in the top-left corner of the screen. Use the top row of number keys to navigate the menu.
Thx Mr. Satan, i didnt even no bout hlamp until you did the "I'm listening to..." on a server.